已知圆O₁：x²+y²=1与圆O₂：x²+y²﹣6x+8y+9=0，则两圆的位置关系为（　　）

完形填空

    About a week ago, when I was playing basketball at our local park, I noticed a small group of boys picking on a smaller, skinnier(皮包骨的) boy. They were 1 him names and even pushed him to the ground and kicked dirt in his face.  2 I saw that, I walked over to the group.

    I stepped 3 them and the smaller boy, and asked them politely what this boy had done worthy （值得）of  4 they were doing to him. One of the boys replied, "He's weird." At that, I asked one of the boys if he thought his friend was weird, and the 5 was" No." So, I asked another boy what the word "weird" 6, andhe said, " Different." That was my cue（暗示）. I told them that everyone is 7, and that they all looked just as different to the other boy as he did to them. They all stood 8for a moment, and then the most amazing thing happened. One of the boys helped the small boy off the ground and then said sorry to him. He 9  to let him play with them.

    I thanked the boy for being so  10. As I looked around, I realized that there were dozens of other people at the park  11no one else had stopped to help this boy. I felt happy that the boy was strong enough to stand up against his friends to 12 someone in need, but I felt sad that  13 else had even taken a second look.

    I hope that my action helped them 14  that they could have made a difference with a little15, and maybe next time they will be the ones who choose to help.

    The sun, the moon and the stars are all in the sky. We see the sun in the day. We see the moon and the stars at night. The sun is a ball. It is bigger than the moon. The sun has a family. It is the biggest in the family. The moon is a ball, too. It is much smaller than the sun. It is smaller than the stars. The light on the moon comes from the sun. The stars look smaller than the sun and the moon. But most of the stars are bigger than the sun. They are very far away from us, so they look small. All day the stars are in the sky. But the light from the sun is too bright. We cannot see the stars in the day.

下列关于电磁波的说法中，正确的是（　　）